When we want to get a value that is close but not necessarily exact, we can use an approximation. One method to approximate a number is known as rounding. Rounding allows us to approximate a number to a specific round off place.

Test Objectives
• Demonstrate the ability to round a whole number to the nearest ten, hundred, & thousand
• Demonstrate the ability to round a whole number to the nearest thousand, ten thousand, & million
• Demonstrate the ability to round a whole number to any high-level place
Rounding Numbers Practice Test:

#1:

Instructions: Round each to the nearest ten, hundred, and thousand.

a) 15,375

b) 373,575

c) 21,583

#2:

Instructions: Round each to the nearest thousand and ten thousand.

a) 5,273,371

b) 65,315

c) 26,300

#3:

Instructions: Round each to the nearest million.

a) 6,375,322

b) 17,955,971

c) 19,100,571

#4:

Instructions: Round each to the nearest billion.

a) 163,517,325,317

b) 224,978,381,500

c) 6,000,000,536,179

#5:

Instructions: Round each to the nearest ten trillions.

a) 169,315,111,827,059

b) 5,978,181,246,056,192

Written Solutions:

#1:

Solutions:

a) nearest ten - 15,380 : nearest hundred - 15,400 : nearest thousand - 15,000

b) nearest ten - 373,580 : nearest hundred - 373,600 : nearest thousand - 374,000

c) nearest ten - 21,580 : nearest hundred - 21,600 : nearest thousand - 22,000

#2:

Solutions:

a) nearest thousand - 5,273,000 : nearest ten thousand - 5,270,000

b) nearest thousand - 65,000 : nearest ten thousand - 70,000

c) nearest thousand - 26,000 : nearest ten thousand - 30,000

#3:

Solutions:

a) 6,000,000

b) 18,000,000

c) 19,000,000

#4:

Solutions:

a) 164,000,000,000

b) 225,000,000,000

c) 6,000,000,000,000

#5:

Solutions:

a) 170,000,000,000,000

b) 5,980,000,000,000,000